Right now, no one knows who the Bucks will pick in the draft. In a few weeks (the draft takes place on June 23), after the Bucks pick someone, no one will know whether that player is going to be good.
Nonetheless, this is the season for mock drafts and then draft grades. People enjoy these things.
Now, this story may strike you as an excuse to talk about Giannis. It is that. It is also interesting to look back at what writers thought about the Giannis pick at the time. Generally speaking, there was a lot of talk about upside, and most erred on the side of commending the Bucks for taking a chance on that upside.